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is there any calculator or simulator for battery DIY?

but if i 19 serial it would be 70.3V
or 20 serial it would be 74V unlike 3.6V cell
so if i overvolt or undervolt like that the BMS will balance it to 72V?

what about amp
the constant current
the battery spec is 30A
so if i 2 parallel will it be 60A?
i need 45A but 60A is dangerous?
how do i make it 45A
should i use lower spec cells?
any way to do it without lower spec cells?

i hope theres layout template by volt and amp or simulator thing to be sure not to blow up anything

what about amp
the constant current
the battery spec is 30A
so if i 2 parallel will it be 60A?
i need 45A but 60A is dangerous?
how do i make it 45A
should i use lower spec cells?
any way to do it without lower spec cells?

i hope theres layout template by volt and amp or simulator thing to be sure not to blow up anything

If I understand you correctly, you are saying you are building a pack that is a 2p configuration using cells that can each handle discharge of 30amps (what cells are they??)?

So:

Yes, the pack is theoretically capable of 60amp discharge.

If your controller can draw 45amps max, that is all that will be demanded of the battery

This is no problem, is not dangerous, and in fact it is better that the cells are not taxed to their maximum rated discharge capability

You don't mention the BMS, but one should be used that can also allow at least 45amps discharge.